linux-kernel - [PATCH 5.16 009/203] mmc: sh_mmcif: Check for null res pointer

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Message-Id: <20220214092510.532676701@linuxfoundation.org>
Date:   Mon, 14 Feb 2022 10:24:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.16 009/203] mmc: sh_mmcif: Check for null res pointer

From: Jiasheng Jiang <jiasheng@...as.ac.cn>

commit 4d315357b3d6c315a7260420c6c6fc076e58d14b upstream.

If there is no suitable resource, platform_get_resource() will return
NULL.
Therefore in order to avoid the dereference of the NULL pointer, it
should be better to check the 'res'.

Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc: stable@...r.kernel.org # v5.16+
Link: https://lore.kernel.org/r/20220119120006.1426964-1-jiasheng@iscas.ac.cn
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mmc/host/sh_mmcif.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -405,6 +405,9 @@ static int sh_mmcif_dma_slave_config(str
 	struct dma_slave_config cfg = { 0, };
 
 	res = platform_get_resource(host->pd, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
+
 	cfg.direction = direction;
 
 	if (direction == DMA_DEV_TO_MEM) {